Here are the sub reddits I subscribe to:
r/netsec, r/purpleteamsec, r/linux, r/tech, r/opensource, r/privacy, r/hacking, r/networking, r/sysadmin, r/Malware, r/msp, r/cybersecurity, r/InternetIsBeautiful, r/redteamsec, r/blueteamsec, r/darknetdiaries.
And here are my multi-reddits that I keep public:
https://www.reddit.com/user/lawrencesystems/m/tech/